Michael Grant 91441d6ef2 regress: rationalise image test coverage, add missing image_support guard
- Extract shared setup for the "noflash" retransmission-avoidance tests
  (image-movepane-drag-noflash.sh, image-splitwindow-resize-noflash.sh,
  image-status-pane-click-noflash.sh, image-selection-noflash.sh) into
  a new image-noflash-common.inc, matching the existing input-common.inc
  convention: dual-server cleanup/fail helpers, the shared SIXEL fixture,
  the attach-and-capture sequence, and the final DCS-retransmission
  assertion. Each test keeps its own distinct interaction and failure
  message; only the copy-pasted scaffolding moved.

- Add the missing #{image_support} runtime guard to
  image-border-status-sixel.sh, which cats a real SIXEL fixture and
  specifically guards a sixel-after-pane-creation ordering bug - without
  it, the DCS sequence is compiled out entirely on a non-image build and
  the test's assertions could pass without exercising anything.
  image-border-status-wipe.sh is deliberately left unguarded: it has no
  image/sixel content at all and guards a general border-status caching
  bug unrelated to ENABLE_IMAGES.

- Reviewed the rest of the branch's regress/image-*.sh tests in full
  (not just headers) for redundant coverage; none warranted merging -
  each guards a genuinely distinct fix via a distinct mechanism.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Welcome to tmux!

tmux is a terminal multiplexer: it enables a number of terminals to be created,
accessed, and controlled from a single screen. tmux may be detached from a
screen and continue running in the background, then later reattached.

This release runs on OpenBSD, FreeBSD, NetBSD, Linux, macOS and Solaris.

* Dependencies

tmux depends on libevent 2.x, available from:

	https://github.com/libevent/libevent/releases/latest

It also depends on ncurses, available from:

	https://invisible-mirror.net/archives/ncurses/

To build tmux, a C compiler (for example gcc or clang), make, pkg-config and a
suitable yacc (yacc or bison) are needed.

* Installation

To build and install tmux from a release tarball, use:

	$ ./configure && make
	$ sudo make install

tmux can use the utempter library to update utmp(5), if it is installed - run
configure with --enable-utempter to enable this.

To get and build the latest from version control - note that this requires
autoconf, automake and pkg-config:

	$ git clone https://github.com/tmux/tmux.git
	$ cd tmux
	$ sh autogen.sh
	$ ./configure && make
	$ sudo make install

* Contributing

Bug reports, feature suggestions and especially code contributions are most
welcome. Please send by email to:

	tmux-users@googlegroups.com

Or open a GitHub issue or pull request.

* Documentation

For documentation on using tmux, see the tmux.1 manpage. View it from the
source tree with:

	$ nroff -mdoc tmux.1|less

A small example configuration is in example_tmux.conf.

Other documentation is available in the wiki:

	https://github.com/tmux/tmux/wiki

Also see the tmux FAQ at:

	https://github.com/tmux/tmux/wiki/FAQ

A bash(1) completion file is at:

	https://github.com/scop/bash-completion/blob/main/completions/tmux

For debugging, run tmux with -v and -vv to generate server and client log files
in the current directory.

* Support

The tmux mailing list for general discussion and bug reports is:

	https://groups.google.com/forum/#!forum/tmux-users

Subscribe by sending an email to:

	tmux-users+subscribe@googlegroups.com

* License

This file and the CHANGES files are licensed under the ISC license. All other
files have a license and copyright notice at their start.
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